Hypogastrura trybomi (Schott, 1893)

Jiang, Jigang & Yin, Wenying, 2010, Two new Hypogastrura species (Hypogastruridae, Collembola) from China, Zootaxa 2542 (1), pp. 48-60 : 59

Key to species of H. trybomi group

1 Mouthparts highly modified, maxillary lamellae 1, 2, 4 and 5 longer than maxillary teeth ....................................... 2

- Mouthparts not highly modified, usually only maxillary lamella 1 longer than maxillary teeth ................................. 5

2 Head ventrally with 2+2 axial setae, ventral file of Ant. IV with fewer than 20 (usually 10–15) setae, labial palp with papilla C absent ............................................................................................................................................................ 3

- Head ventrally with 3+3 axial setae, ventral file of Ant. IV with more than 20 (usually 20–55) setae, labial palp with papilla C present .......................................................................................................................................................... 4

3 Th. II without m 2 seta, dens with six setae, Ant. IV with six sensilla ........................................................ H. hargrovei

- Th. II with m 2 seta, dens with seven setae, Ant. IV with ten sensilla ....................................... H. heptasetata sp. nov.

4 Th. II without m 2 seta, maxillary outer lobe with two sublobal hairs, dens with seven setae, tibiotarsus with differentiated tenent hair......................................................................................................................................... H. maxillosa

- Th. II with m 2 seta, maxillary outer lobe with one sublobal hair, dens with six setae, tibiotarsus without differentiated tenent hair ................................................................................................................................... H. hexasetata sp. nov.

5 Ratio anal spine: basal papilla as 1.5–2.0: 1, Ant. IV with 7–8 well differentiated sensilla ........................... H. lima

- Ratio anal spine: basal papilla as about 1.0: 1, Ant. IV with some weakly differentiated sensilla ........................... 6

6 Ventral tube with 6+6–9+9 setae, ventral file of Ant. IV with about ten setae ............................................. H. trybomi

- Ventral tube with 4+4 setae, ventral file of Ant. IV with at least twenty setae .......................................................... 7

7 Thorax II with m 2 setae, tibiotarsal tenent hair pointed, ventral file of Ant. IV with more than thirty setae ................ ................................................................................................................................................................ H. oregonensis

- Thorax II without m 2 setae, tibiotarsal tenent hair knobbed, ventral file of Ant. IV with about twenty setae ............... ........................................................................................................................................................................ H. tethyca